Auto-tuning of gauge

Hello
I am working on a gas mixer with three mass flow controllers. The UI which i am developing with LABVIEW contains a gauge for specifying the total flow of the three gases and three other guages for three separate gases which denote the ratio of the amount of the respective gases that shouldto be controlled by the individual mfc's. Now the problem is these ratio gauges have to be auto-tunable. Like, for xample, if i change the ratio for gas1, the other two ratios will adjust among themselves to keep the total flow constant. I am unable to find a solution for this because in C we use variables for denoting the change in one number while in labview we dont have such privileges. So can you suggest me a simple way out for the solution of this problem.
Thanks and regards

Suppose there are 3 ratio gauges A, B and C. I have given the total flow as say 15units and I have set the ratio in A as 3, in B as 5 and in C as 7. Now I changed the ratio in A to 4. So B and C will auto-tune among themselves and will increase and decrease correspondingly and the changed value will be shown in the front panel. I am attaching the screenshot of the front panel.
Attachments:
test.JPG ‏140 KB

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Thanks

Bruno,
It would be good to get the screenshots of the following:
1. The incident/event from Incident Manager that indicates the DB is down. Specifically - please capture snapshots of the "Updates" tab within the details.
2. The ruleset definition - since you say you got at least one email - I'll assume the target list on the ruleset is ok - so please provide screenshots of the specific rule including the selection criteria and the actions.
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Hi sir
for my project in auto tuning of pid controller using labview,for that
i require a simple circuit diagram(lab view figure) and have no problem in running for that
i will be very thankful to you

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there are notes i write but struggle hitting
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Auto-tuning of gauge

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